Bump github.com/cloudflare/circl from 1.6.1 to 1.6.3 in /sdk (#219)

Bumps [github.com/cloudflare/circl](https://github.com/cloudflare/circl) from 1.6.1 to 1.6.3.
- [Release notes](https://github.com/cloudflare/circl/releases)
- [Commits](cloudflare/circl@v1.6.1...v1.6.3)

---
updated-dependencies:
- dependency-name: github.com/cloudflare/circl
  dependency-version: 1.6.3
  dependency-type: indirect
...

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